1. CS 301 Fall 2001 – Chapter 3
Slides by Prof. Hartman, following “IBM PC Assembly Language Programming” by Peter Abel
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2. Using DEBUG Tutorial on the web. Appendix C in the book.
DEBUG is not case sensitive.
All numbers are hexadecimal.
Spaces are used to separate parameters.
Segments and offsets are specified as segment::offset.
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3. DEBUG Commands A Assemble instructions C Compare two areas of memory
D Display contents of memory
E Enter data into memory
F Fill memory
G Run the executable in memory. (Go)
H Perform hexadecimal arithmetic
I Input and display one byte from a port.
L Load a file or disk sectors into memory.
M Move (or copy) memory
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4. DEBUG Commands 2 N Name a program O Output a byte to a port
P Proceed (execute CALL, LOOP, INT or REP)
Q Quit
R Display the contents of one or more registers
S Search memory
T Trace the execution of one instruction
U Unassemble (disassemble) machine code.
W Write a (named, .COM) file to disk
? Display help screen
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5. DEBUG Examples Work through examples in the text: pages 36—48.
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